I see in another forum thread you are having it examined...at the dealership, yes? If so, have you informed them of the plug/coil issue being experienced by other members? The issue may not yet be known to those outside of these boards...

Well, he has posted abot an issue with violently jerking, sounds more like a transmission related issue and not ignition.
I personally drive a 3.3 and so far the 3.3 stock have not reported any problems with
spark plugs.